Synthesis and voltammetric study of some new macrocyclic sulfur compounds for use as chelating agents for separation of arsenic (III) in wastewater and as molluscicidal agents against Biomophalaria Alexandrina Snails

A series of some new nanomeric molecules of cyclic 5- methoxy -5, 6–diaryl -4,5-dihydro -2H-1,2,4–triazin -3-thiones (1-3) has been synthesized. The interaction of compounds 1-3 with HgCl2 in 1:1 and 1:2 molar ratios was used for the synthesis of the macrocyclic Schiff base [5,6, 11,12 - tetraaryl -1,2,4,7,8,10- hexa-aza cyclododoeca -4,6,10,12- tetraene -3,9-dithione] (4), macrocyclic thioethers 5 and/or complex 6. Chemical structures of the compounds were determined from elemental analysis and spectral measurements. The compounds were screened as molluscicidal agents against Biomophalaria Alexandrina Snails which cause Bilhariziasis. Cyclic voltammetry of selected compounds showed well-defined irreversible electrode couple suggesting application of these compounds as chelating agents for separation of arsenic in industrial wastewater samples. Compound 1 was physically immobilized onto polyurethane foams (PUFs) and was successfully used for complete removal of arsenic (III) & (V) species from wastewater.